Frequent users of artificial intelligence chatbots for health advice are significantly more likely to believe false claims about vaccines, according to a new poll from health research firm KFF. The survey of a representative sample of 2,480 US adults, conducted in May, found a clear correlation between reliance on AI tools and endorsement of myths such as vaccines causing autism. This connection persisted even after researchers controlled for age, race, education, and political affiliation.
The findings raise fresh concerns about the role of AI in spreading medical misinformation, particularly as more Americans turn to chatbots for quick health guidance. KFF's data suggests the behavior is not merely a reflection of broader demographic trends, but may be tied to the way these tools present or amplify unsubstantiated claims. The poll specifically cited falsehoods about the measles vaccine being more dangerous than the disease itself.
Researchers found that the correlation held across all measured demographic groups, making it a robust statistical signal rather than a coincidence. While the poll does not establish causation, it strongly suggests that frequent exposure to AI-generated health content may reinforce existing doubts or introduce new ones. The survey did not break down results by specific AI platforms or chatbots.
Public health officials worry that such trends could undermine vaccination rates, especially as measles cases have been on the rise in parts of the US. If chatbots are amplifying misconceptions, regulatory scrutiny of how these tools handle health queries may intensify. The KFF poll adds to a growing body of research examining the societal effects of unmoderated AI information streams.
Critics note that correlation does not prove causation, and that people already distrustful of medicine may simply be drawn to AI tools that confirm their biases. More research is needed to determine whether chatbots actively generate misinformation or merely reflect what users ask.